AGE DETERMINATION OF LIMESTONE ROCKS LEANG - LEANG CAVE COMPIL- ER THROUGH ACTIVITY MEASUREMENTS 14C USING LSC
Abstract
Age Determination of Limestone of Leang - Leang Cave Through Activity Measurements of 14C Using LSC. This research has been carried out by using limestone samples taken from Leang- Leang Cave, Maros. Limestone is one of the environmental samples with a constituent of calcite mineral (CaCO3) which is derived from the remains of flora and fauna that has been weathered and petrified. Sample preparation was done physically and chemically. Preparation of chemically by using a mixture of NaOH with 30% H2O2 followed by a mixture of HClO4 with 30% H2O2, and the last with HCl solution to produce a clean sample with a weight reduction of 3,36% - 4,44%. Car- bonate matrix samples as CO2 is produced by reaction with 85% H3PO4 and absorbed by 1M KOH solution as K2CO3. The total carbon in the sample solution is 0,6144 - 0,9696 grams obtained through titration method. Radiocarbon dating method based on the measurement of the specific activity of the samples obtained from the results of counts LSC (Liquid Scintilation Counter) Hidex 300 SL. The specific activity of both of samples were 1,609±0,0359 DPM/g C and 7,718±0,109 DPM/g C. Age of both of limestone samples which were calculated from the specific activity were 25.607,403 ± 919,305 years and 8457,792 ± 921,899 years for BG I and BG II, re- spectively.
References
Adkinds, J.F., Griffin, S., Kashgarian, M., Cheng, H., Druffel E.R.M., Boyle, E.A., Edwards, R.L., dan Shen, C.C., 2002, Radiocarbon Dating of Deep Sea Corals, Radiocarbon, 44, (2); 567-580.
Daryanto, A., dan Oktariadi, O., 2009, Klasifikasi Kawasan Kars Maros, Sulawesi Selatan untuk Menentukan Kawasan Lindung dan Budidaya, Buletin Geologi Tata Lingkungan (Bulletin Of Environmental Geolo- gy), 19, (2); 67-81.
Djuhariningrum, T., dan Rusmadi, 2004, Penentuan Kalsit dan Dolomit Secara Kimia dalam Batu Gamping dari Madura, Pusat Pengembangan Geologi Nuklir, BATAN, Jakarta, (332-334).
Hiskia, A,. dan, Tupamahu, M.S., 200, Struktur Atom, Struktur Molekul dan sistem Periodik, Bandung.
Libby, W.F., 1960, Radiocarbon Dating, University of Chicago Press, Chica- go.
Prawitosari, T., 2011, Dampak Penam- bangan di Kawasan Kars Maros Terhadap Lingkungan, Disajikan pada Workshop Lembaga Kars In- donesia pada Tanggal 19 Oktober
di Bogor, Staf Peneliti Pusat Penelitian Lingkungan Hidup, Uni- versitas Hasanuddin, Makassar.
Salam, Z.M., 1995, Penentuan Aktivitas Sulfur-35 dalam Organ Tumbuhan Eceng Gondok dengan Metode Pen- cacah Sintilasi Cair, Skripsi tidak diterbitkan, Jurusan Kimia, FMIPA, Universitas Hasanuddin, Makassar.
Satrio, 2009, Penentuan Umur Karbon dengan Metode Absorpsi CO2, Pusat Aplikasi Isotop dan Radiasi, BATAN, Jakarta. 12, (1); 47-54.
Siregar, D.A., 2011, Radiokarbon bagi Penentuan Umur Candi Bojong- menje di Rancaekek, Jawa Barat, Bandung, (27).
Suhadi, F., Sisworo, E.L., Maha, M., dan Soebianto, Y.S., 1998, Kimia Ling- kungan, Proses Radiasi dan Industri Jilid 2, Pusat Aplikasi Isotop dan Radiasi, BATAN, Jakarta.
